This article introduces LU Zhizheng’ s experience in diagnosing and treating hyperthyroidism in children. Prof. LU holds that hyperthyroidism in children could be caused by emotions

and the cause is focused on liver depression

and is related with the dysfunction of five-zang. When the water could not be transported and transformed

phlegm will be formed

then liver depression forms fire

phlegm-heat obstructs

and finally the hyperthyroidism develops. In treatment

nourishing Yin and calming liver should be used. Prof. LU emphasizes to protect spleen and stomach

and to regulate liver from lung

which means to assist metal to calm wood.